Re: Serial Communication in Visual C++
Ryan Neuhart wrote:
Right, I only initialize once. Sorry for the confusion on my part. I am
running this through a simulation environment. Initially I had the time
step set to 0.02 sec, but realized that this may be too fast for the serial
connection. However, I get the same result when setting the time step to as
slow as 2.0 secs. Each step I write the following to the serial port:
OutputVoltage = DesiredRPM * (1/183.9);
sprintf(buf,":CHAN1:VOLT %g",OutputVoltage);
g_SupTalk.Write(buf, strlen(buf));
where "buf" has been declared as:
char buf[50];
and g_SupTalk is an instance of the class that is used
and the following is the Write function:
int CCommTalk::Write(const char *pBuf, int nBytes) {
DWORD ByteCount;
CheckDelay();
if (!WriteFile(m_hCommPort, pBuf ,nBytes, &ByteCount, NULL))
return 0;
return ByteCount;
}
So, operating this way, the power supply eventually outputs the proper
desired voltage ( = "OutputVoltage"), but there is a serious delay involved.
As of now, I am not waiting for any response and am not explicitly setting
any flow control (since the power supply documentation said it didn't use
any). Also, I am performing this Write fcn each time step (just to
re-emphasize).
Thanks for the help.
-Ryan
I don't see any problem that could cause a significant delay. Visual
C++ can certainly keep the port busy at 9600 baud, and even higher. It
should take about 50 milliseconds to send your 50 char buffer at 9600 baud.
I suggest you analyze the code and timing with OutputDebugString to send
strings to the debugger output window at various points. Use
GetTickCount to put time references into this output. This should give
you a better idea of where the time is being lost. You just might be
confused about the timer you are using, or you might be opening/closing
the port for each message.
--
Scott McPhillips [VC++ MVP]
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